Alysha The Suffering
As you're party progress through the city, you see misery, no one was spared, not man, woman, or child.
As you go through the almost unending horde of undead, you've part heard a soft melody.
"Wither & Decay... End this destiny~ break these earthly chains, and set the spirit free~" the voice sang beautifully, it was sung in a sickly melody... Role Wisdom Saving throw.
When you heard this melody, you started singing along, walking towards the voice. "Take what has been hurt, grant them no mercy~" make a constitution saving... "Bend and break the regions, set the spirit free~" was the last thing your party heard.
You took a step... Before counterspell/roll the correct saving, as you regain your senses, you notice the cloudkill spell, after dispelling it, your party moved forward.
And you all see a sickly pale woman, her being surrounded by undead, she turned to you all, her gaze expressionless, void of any emotion except for the three emotions in her nearly soulless eyes as she sang.
"Bend and Break regions, and set the spirit free~ the spirit free~" she sung as she finally faces your party, tears streaming down, full of regret, grief, and pain... Roll initiative.
I've changed up the mini-boss enemy concept, Alysha will be some sort of Lich, leading an army for the BBEG, one of his generals if you want to call it that. If you wanna know more, let me know!
Ps. I didn't make the song, it's from a YouTuber when I was looking for a melody for Alysha, go and support Annapantsu, also the original belongs to the tangles series.